 <section id="chart_pie_section" >
    <header>
        <nav class="left">
            <a href="#" data-icon="previous" data-target="back">Back</a>
        </nav>
        <h1 class="title">Pie</h1>
    </header>
    <article class="active">
        <ul class="control-group" id="changePieType" style="margin:10px 30px;">
            <li class="active" data-type="pie">饼图</li>
            <li data-type="dount">环形图</li>
        </ul>
        <div class="chartTitle">网站访问来源</div>
        <canvas id="pie_canvas"></canvas>
        <div id="pie_segment_info" class="arrow_container">
        </div>
    </article>
</section>